Measurement & project guide
Count the brick module before choosing a purchase allowance
A brick's face dimensions, mortar joint and number of wythes determine installed quantity. Wall thickness and brick voids then affect the limits of a geometry-based mortar estimate.
- A Net wall length
- B Wall height
- C Openings
Before you calculate
- Face area
- Measure length × height and deduct the total area of doors and windows. Use the same wall face for both measurements.
- Module
- Add one joint to the actual length and one to the actual height. Confirm the brick size and bond with the supplier.
- Wythes and mortar
- Enter the real number of brick leaves. Use the selected mortar's mixed yield; do not substitute the yield of bagged concrete.
Read the result before using it
- Installed equivalents
- Net wall area divided by one face module, multiplied by wythes. This retains fractions until purchase rounding.
- Bricks to order
- Installed equivalents plus your allowance, rounded upward. Returns, special cuts and color blending need separate review.
- Mortar volume
- An idealized joint-volume estimate. Frogs, cores, tooling, bedding practice and site losses can change consumption.
Check before ordering or handing over
- Schedule corners, closures, arches, sills and special shapes independently.
- Check veneer ties, flashing, drainage and movement joints against the specified assembly.
- Ask whether the supplier sells loose bricks, packs or full pallets and how batches are matched.
Detailed results and planning tools
View quantities, report and comparisons
Calculation details
| Quantity | Value |
|---|
Calculation report
Includes formulas, assumptions, limitations and identified sources.
Compare scenarios
Keep up to three alternatives while comparing dimensions, waste, packages or pricing.
Quick answer#
The brick calculator divides net wall area by the face module of one brick and mortar joint, multiplies by the entered number of wythes, then adds the explicit waste allowance. It also provides an idealized mortar-joint volume and whole mortar-bag count.
Brick calculation formula#
For a rectangular wall, gross area = length × height. Known-area mode skips that step. Net area equals gross area minus the combined area of openings.
The brick face module is (actual brick length + joint) × (actual brick height + joint). Installed bricks equal net area ÷ module area × wythes. Bricks to order equal installed bricks × (1 + waste percentage), rounded upward.
Worked example#
A 20 ft × 8 ft wall with 20 ft² of openings has 140 ft² of net face area. Using a 7⅝ × 2¼ in modular brick face with a ⅜ in joint produces an 8 × 2⅝ in module. One wythe requires approximately 960 installed bricks; adding 5% waste rounds the purchase estimate to 1,008 bricks.
Brick size and mortar joints#
Brick names do not guarantee identical physical dimensions. The Brick Industry Association explains that actual brick size, specified mortar-joint thickness and modular coordination work together. Measure or obtain the data sheet for the product being ordered.
The preset list is only a convenient starting point. Custom dimensions keep the formula usable for local products and nonstandard units.
Mortar estimate#
The theoretical joint volume equals net wall volume minus the solid volume of the installed bricks. Dividing that volume by the entered packaged-mortar yield gives whole bags.
This geometric method cannot predict bond-specific cuts, brick frogs or cores, joint tooling, spillage, absorption, batching or workmanship. Confirm mortar type and yield with the project specification and product manufacturer.
Assumptions and limitations#
The calculator estimates material quantities only. It does not design wall thickness, structural capacity, veneer support, ties, reinforcement, lintels, flashing, drainage, foundations, movement joints or code compliance. Waste and cost are based only on user entries.
Sources and methodology#
- Brick Industry Association Technical Note 10: Dimensioning and Estimating Brick Masonry — brick dimension, modular-coordination and estimating context.
- NIST SP 811 conversion factors — U.S. customary and SI conversions.
- ASTM masonry standards overview — standards context; the calculator does not certify a brick, mortar or assembly.
Sources support the measurement method. Product dimensions, bond, mortar type, yield and construction requirements remain project-specific.
Frequently asked questions
How many bricks do I need for a wall?
Enter gross wall dimensions or known area, subtract the total area of doors and windows, choose or enter actual brick dimensions and mortar joint, then apply an explicit waste allowance. The calculator rounds the purchase count upward.
Does the brick calculator subtract windows and doors?
Yes. Enter their combined area. The calculator subtracts that area before determining the installed brick count and rejects openings that equal or exceed the gross wall area.
Are brick dimensions nominal or actual?
The calculation uses the actual brick face dimensions plus the entered mortar joint. Presets are editable starting values. Verify the product data because brick names and dimensions vary.
How is mortar estimated?
The tool calculates an idealized geometric joint volume from wall volume minus brick volume, then divides by the entered mortar yield per bag. It does not model bond-specific waste, frogs, cores, tooling or field loss.
What is a brick wythe?
A wythe is one vertical thickness or leaf of masonry. Increasing wythes multiplies the brick and joint-volume estimate. Confirm the actual wall assembly rather than assuming veneer and structural masonry are equivalent.
What waste percentage should I use?
Waste depends on bond, cuts, corners, breakage, workmanship, brick availability and supplier packaging. Use project specifications and supplier guidance; the calculator does not impose a universal rate.
Does this calculate structural wall requirements?
No. It does not design ties, lintels, flashing, reinforcement, foundations, movement joints, drainage or code compliance. It is a material-planning estimate.